/**
 * Copyright (C) 2013 DaiKit.com - daikit4gxt module (admin@daikit.com)
 *
 *         Project home : http://code.daikit.com/daikit4gxt
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.daikit.daikit4gxt.client.loader;

import java.util.ArrayList;
import java.util.List;

import com.sencha.gxt.data.shared.loader.DataReader;
import com.sencha.gxt.data.shared.loader.MemoryProxy;
import com.sencha.gxt.data.shared.loader.PagingLoadConfig;
import com.sencha.gxt.data.shared.loader.PagingLoadResult;
import com.sencha.gxt.data.shared.loader.PagingLoadResultBean;


/**
 * A Proxy for {@link BaseMemoryPagingLoader}
 * 
 * @author tcaselli
 * @version $Revision$ Last modifier: $Author$ Last commit: $Date$
 * @param <B>
 *           the data type
 */
public class BaseMemoryPagingLoaderProxy<B> extends MemoryProxy<PagingLoadConfig, List<B>>
{

	private DataReader<PagingLoadResult<B>, List<B>> reader;

	/**
	 * Constructor
	 */
	public BaseMemoryPagingLoaderProxy()
	{
		super(new ArrayList<B>());
		reader = new DataReader<PagingLoadResult<B>, List<B>>()
		{
			@Override
			public PagingLoadResult<B> read(final Object loadConfig, final List<B> data)
			{
				final PagingLoadConfig pagingLoadConfig = (PagingLoadConfig) loadConfig;
				final PagingLoadResultBean<B> pagingLoadResult = new PagingLoadResultBean<B>();
				final int offset = pagingLoadConfig.getOffset();
				final List<B> result = new ArrayList<B>();
				pagingLoadResult.setOffset(offset);
				pagingLoadResult.setTotalLength(data.size());
				if (offset < data.size())
				{
					for (int i = offset; i < offset + pagingLoadConfig.getLimit() && i < data.size(); i++)
					{
						result.add(data.get(i));
					}
				}
				pagingLoadResult.setData(result);
				return pagingLoadResult;
			}
		};
	}

	/**
	 * @return the reader
	 */
	public DataReader<PagingLoadResult<B>, List<B>> getReader()
	{
		return reader;
	}

}
